package com.ems.util;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;

import javax.net.ssl.*;
import java.io.*;
import java.net.ConnectException;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.StandardCharsets;
import java.security.cert.X509Certificate;

/**
 * 通用http发送方法
 */
@Slf4j
public class HttpUtils {

    /**
     * 向指定 URL 发送GET方法的请求
     * @param url 发送请求的 URL
     * @return 所代表远程资源的响应结果
     */
    public static String sendGet (String url) {
        return sendGet ( url, StringUtils.EMPTY );
    }

    /**
     * 向指定 URL 发送GET方法的请求
     * @param url   发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendGet (String url, String param) {
        return sendGet ( url, param, "UTF-8" );
    }

    /**
     * 向指定 URL 发送GET方法的请求
     * @param url         发送请求的 URL
     * @param param       请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @param contentType 编码类型
     * @return 所代表远程资源的响应结果
     */
    public static String sendGet (String url, String param, String contentType) {
        StringBuilder result = new StringBuilder ();
        BufferedReader in = null;
        try {
            String urlNameString = StringUtils.isNotBlank ( param ) ? url + "?" + param : url;
            log.info ( "sendGet - {}", urlNameString );
            URL realUrl = new URL ( urlNameString );
            URLConnection connection = realUrl.openConnection ();
            connection.setRequestProperty ( "accept", "*/*" );
            connection.setRequestProperty ( "connection", "Keep-Alive" );
            connection.setRequestProperty ( "user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)" );
            connection.connect ();
            in = new BufferedReader ( new InputStreamReader ( connection.getInputStream (), contentType ) );
            String line;
            while ( ( line = in.readLine () ) != null ) {
                result.append ( line );
            }
            log.info ( "recv - {}", result );
        } catch ( ConnectException e ) {
            log.error ( "调用HttpUtils.sendGet ConnectException, url=" + url + ",param=" + param, e );
        } catch ( SocketTimeoutException e ) {
            log.error ( "调用HttpUtils.sendGet SocketTimeoutException, url=" + url + ",param=" + param, e );
        } catch ( IOException e ) {
            log.error ( "调用HttpUtils.sendGet IOException, url=" + url + ",param=" + param, e );
        } catch ( Exception e ) {
            log.error ( "调用HttpsUtil.sendGet Exception, url=" + url + ",param=" + param, e );
        } finally {
            try {
                if ( in != null ) {
                    in.close ();
                }
            } catch ( Exception ex ) {
                log.error ( "调用in.close Exception, url=" + url + ",param=" + param, ex );
            }
        }
        return result.toString ();
    }

    /**
     * 向指定 URL 发送POST方法的请求
     * @param url   发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost (String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        StringBuilder result = new StringBuilder ();
        try {
            log.info ( "sendPost - {}", url );
            URL realUrl = new URL ( url );
            URLConnection conn = realUrl.openConnection ();
            conn.setRequestProperty ( "accept", "*/*" );
            conn.setRequestProperty ( "connection", "Keep-Alive" );
            conn.setRequestProperty ( "user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)" );
            conn.setRequestProperty ( "Accept-Charset", "utf-8" );
            conn.setRequestProperty ( "contentType", "utf-8" );
            conn.setDoOutput ( true );
            conn.setDoInput ( true );
            out = new PrintWriter ( conn.getOutputStream () );
            out.print ( param );
            out.flush ();
            in = new BufferedReader ( new InputStreamReader ( conn.getInputStream (), StandardCharsets.UTF_8 ) );
            String line;
            while ( ( line = in.readLine () ) != null ) {
                result.append ( line );
            }
            log.info ( "recv - {}", result );
        } catch ( ConnectException e ) {
            log.error ( "调用HttpUtils.sendPost ConnectException, url=" + url + ",param=" + param, e );
        } catch ( SocketTimeoutException e ) {
            log.error ( "调用HttpUtils.sendPost SocketTimeoutException, url=" + url + ",param=" + param, e );
        } catch ( IOException e ) {
            log.error ( "调用HttpUtils.sendPost IOException, url=" + url + ",param=" + param, e );
        } catch ( Exception e ) {
            log.error ( "调用HttpsUtil.sendPost Exception, url=" + url + ",param=" + param, e );
        } finally {
            try {
                if ( out != null ) {
                    out.close ();
                }
                if ( in != null ) {
                    in.close ();
                }
            } catch ( IOException ex ) {
                log.error ( "调用in.close Exception, url=" + url + ",param=" + param, ex );
            }
        }
        return result.toString ();
    }

    public static String sendSSLPost (String url, String param) {
        StringBuilder result = new StringBuilder ();
        String urlNameString = url + "?" + param;
        try {
            log.info ( "sendSSLPost - {}", urlNameString );
            SSLContext sc = SSLContext.getInstance ( "SSL" );
            sc.init ( null, new TrustManager[]{new TrustAnyTrustManager ()}, new java.security.SecureRandom () );
            URL console = new URL ( urlNameString );
            HttpsURLConnection conn = (HttpsURLConnection) console.openConnection ();
            conn.setRequestProperty ( "accept", "*/*" );
            conn.setRequestProperty ( "connection", "Keep-Alive" );
            conn.setRequestProperty ( "user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)" );
            conn.setRequestProperty ( "Accept-Charset", "utf-8" );
            conn.setRequestProperty ( "contentType", "utf-8" );
            conn.setDoOutput ( true );
            conn.setDoInput ( true );

            conn.setSSLSocketFactory ( sc.getSocketFactory () );
            conn.setHostnameVerifier ( new TrustAnyHostnameVerifier () );
            conn.connect ();
            InputStream is = conn.getInputStream ();
            BufferedReader br = new BufferedReader ( new InputStreamReader ( is ) );
            String ret = "";
            while ( ( ret = br.readLine () ) != null ) {
                if ( ret != null && ! "".equals ( ret.trim () ) ) {
                    result.append ( new String ( ret.getBytes ( StandardCharsets.ISO_8859_1 ), StandardCharsets.UTF_8 ) );
                }
            }
            log.info ( "recv - {}", result );
            conn.disconnect ();
            br.close ();
        } catch ( ConnectException e ) {
            log.error ( "调用HttpUtils.sendSSLPost ConnectException, url=" + url + ",param=" + param, e );
        } catch ( SocketTimeoutException e ) {
            log.error ( "调用HttpUtils.sendSSLPost SocketTimeoutException, url=" + url + ",param=" + param, e );
        } catch ( IOException e ) {
            log.error ( "调用HttpUtils.sendSSLPost IOException, url=" + url + ",param=" + param, e );
        } catch ( Exception e ) {
            log.error ( "调用HttpsUtil.sendSSLPost Exception, url=" + url + ",param=" + param, e );
        }
        return result.toString ();
    }

    private static class TrustAnyTrustManager implements X509TrustManager {
        @Override
        public void checkClientTrusted (X509Certificate[] chain, String authType) {
        }

        @Override
        public void checkServerTrusted (X509Certificate[] chain, String authType) {
        }

        @Override
        public X509Certificate[] getAcceptedIssuers () {
            return new X509Certificate[]{};
        }
    }

    private static class TrustAnyHostnameVerifier implements HostnameVerifier {
        @Override
        public boolean verify (String hostname, SSLSession session) {
            return true;
        }
    }

    /**
     * 检查指定IP是否在线
     * @param ip
     * @return
     */
    public static boolean isOnline (String ip) {
        log.info ( "检查IP是否在线->{}", ip );
        if ( StringUtils.isEmpty ( ip ) ) {
            return false;
        }
        boolean connect = false;
        Runtime runtime = Runtime.getRuntime ();
        Process process;
        try {
            process = runtime.exec ( "ping " + ip );
            InputStream is = process.getInputStream ();
            InputStreamReader isr = new InputStreamReader ( is );
            BufferedReader br = new BufferedReader ( isr );
            String line = null;
            StringBuffer sb = new StringBuffer ();

            int m = 0;
            while ( ( line = br.readLine () ) != null ) {
                sb.append ( line );
                m++;
                if ( m > 3 ) {
                    break;
                }
            }
            is.close ();
            isr.close ();
            br.close ();
            if ( null != sb && ! sb.toString ().equals ( "" ) ) {
                String logString = sb.toString ();
                boolean r;
                if ( isWindows () ) {
                    r = sb.toString ().indexOf ( "TTL" ) > 0;
                } else {
                    r = ( logString.contains ( "ttl=" ) || logString.contains ( "TTL=" ) ) && logString.contains ( "ms" );
                }
                if ( r ) {
                    // 网络畅通
                    connect = true;
                } else {
                    // 网络不畅通
                    connect = false;

                }
            }
        } catch ( IOException e ) {
            e.printStackTrace ();
        }
        return connect;
    }


    /**
     * 检查操作系统类型
     * @return
     */
    public static boolean isWindows () {
        String os = System.getProperty ( "os.name" ).toLowerCase ();
        return os.startsWith ( "windows" );
    }
}